150 lines
4.0 KiB
C
150 lines
4.0 KiB
C
/*
|
|
* Copyright (C) 2016 Michael Brown <mbrown@fensystems.co.uk>.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of the
|
|
* License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
* 02110-1301, USA.
|
|
*
|
|
* You can also choose to distribute this program under the terms of
|
|
* the Unmodified Binary Distribution Licence (as given in the file
|
|
* COPYING.UBDL), provided that you have satisfied its requirements.
|
|
*/
|
|
|
|
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
|
|
|
|
#include <stdint.h>
|
|
#include <errno.h>
|
|
#include <ipxe/pci.h>
|
|
#include <ipxe/pciea.h>
|
|
|
|
/** @file
|
|
*
|
|
* PCI Enhanced Allocation
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* Locate PCI Enhanced Allocation BAR equivalent entry
|
|
*
|
|
* @v pci PCI device
|
|
* @v bei BAR equivalent indicator
|
|
* @ret offset PCI Enhanced Allocation entry offset, or negative error
|
|
*/
|
|
static int pciea_offset ( struct pci_device *pci, unsigned int bei ) {
|
|
uint8_t entries;
|
|
uint32_t desc;
|
|
unsigned int i;
|
|
int offset;
|
|
|
|
/* Locate Enhanced Allocation capability */
|
|
offset = pci_find_capability ( pci, PCI_CAP_ID_EA );
|
|
if ( offset < 0 )
|
|
return offset;
|
|
|
|
/* Get number of entries */
|
|
pci_read_config_byte ( pci, ( offset + PCIEA_ENTRIES ), &entries );
|
|
entries &= PCIEA_ENTRIES_MASK;
|
|
|
|
/* Locate first entry */
|
|
offset += PCIEA_FIRST;
|
|
|
|
/* Search for a matching entry */
|
|
for ( i = 0 ; i < entries ; i++ ) {
|
|
|
|
/* Read entry descriptor */
|
|
pci_read_config_dword ( pci, offset, &desc );
|
|
|
|
/* Check for a matching entry */
|
|
if ( ( desc & PCIEA_DESC_ENABLED ) &&
|
|
( bei == PCIEA_DESC_BEI ( desc ) ) )
|
|
return offset;
|
|
|
|
/* Move to next entry */
|
|
offset += ( ( PCIEA_DESC_SIZE ( desc ) + 1 ) << 2 );
|
|
}
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
/**
|
|
* Read PCI Enhanced Allocation BAR equivalent value
|
|
*
|
|
* @v pci PCI device
|
|
* @v bei BAR equivalent indicator
|
|
* @v low_offset Offset to low dword of value
|
|
* @ret value BAR equivalent value
|
|
*/
|
|
static unsigned long pciea_bar_value ( struct pci_device *pci, unsigned int bei,
|
|
unsigned int low_offset ) {
|
|
uint32_t low;
|
|
uint32_t high;
|
|
int offset;
|
|
|
|
/* Locate Enhanced Allocation offset for this BEI */
|
|
offset = pciea_offset ( pci, bei );
|
|
if ( offset < 0 )
|
|
return 0;
|
|
|
|
/* Read BAR equivalent */
|
|
offset += low_offset;
|
|
pci_read_config_dword ( pci, offset, &low );
|
|
if ( low & PCIEA_LOW_ATTR_64BIT ) {
|
|
offset += PCIEA_LOW_HIGH;
|
|
pci_read_config_dword ( pci, offset, &high );
|
|
if ( high ) {
|
|
if ( sizeof ( unsigned long ) > sizeof ( uint32_t ) ) {
|
|
return ( ( ( uint64_t ) high << 32 ) | low );
|
|
} else {
|
|
DBGC ( pci, PCI_FMT " unhandled 64-bit EA BAR "
|
|
"%08x%08x\n",
|
|
PCI_ARGS ( pci ), high, low );
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
return low;
|
|
}
|
|
|
|
/**
|
|
* Find the start of a PCI Enhanced Allocation BAR equivalent
|
|
*
|
|
* @v pci PCI device
|
|
* @v bei BAR equivalent indicator
|
|
* @ret start BAR start address
|
|
*
|
|
* If the address exceeds the size of an unsigned long (i.e. if a
|
|
* 64-bit BAR has a non-zero high dword on a 32-bit machine), the
|
|
* return value will be zero.
|
|
*/
|
|
unsigned long pciea_bar_start ( struct pci_device *pci, unsigned int bei ) {
|
|
unsigned long base;
|
|
|
|
base = pciea_bar_value ( pci, bei, PCIEA_LOW_BASE );
|
|
return ( base & ~PCIEA_LOW_ATTR_MASK );
|
|
}
|
|
|
|
/**
|
|
* Find the size of a PCI Enhanced Allocation BAR equivalent
|
|
*
|
|
* @v pci PCI device
|
|
* @v bei BAR equivalent indicator
|
|
* @ret size BAR size
|
|
*/
|
|
unsigned long pciea_bar_size ( struct pci_device *pci, unsigned int bei ) {
|
|
unsigned long limit;
|
|
|
|
limit = pciea_bar_value ( pci, bei, PCIEA_LOW_LIMIT );
|
|
return ( limit ? ( ( limit | PCIEA_LOW_ATTR_MASK ) + 1 ) : 0 );
|
|
}
|